I never said blood magic was the answer. I can't stand blood mages; they make the rest of us look bad. But come on. You can't claim Templars don't push mages to it more often than not.
Do you know what some of the effects of solitary confinment are? Uncontrolable rage and fear, hallucinations, and poor impulse control. Tell me how it's a good idea to subject mages to something that makes it harder to control their impulses?